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LM78XX / LM78XXA 3-Terminal 1 A Positive Voltage Regulator Features Description • • • • • The LM78XX series of three-terminal positive regulators is available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut-down, and safe operating area protection. If adequate heat sinking is provided, they can deliver over 1 A output current.
Input Series Pass Element 1 Current Generator Starting Circuit Reference Voltage Output 3 SOA Protection Error Amplifier Thermal Protection GND 2 Figure 1. Block Diagram Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 10 V, CI = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. TJ = +25°C 4.80 5.00 5.20 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 7 V to 20 V 4.75 5.00 5.25 Regline Line Regulation(2) TJ = +25°C Regload Load Regulation(2) TJ = +25°C IQ Quiescent Current TJ = +25°C ΔIQ Quiescent Current Change ΔVO/ΔT VN VO Unit V VI = 7 V to 25 V 4.0 100.0 VI = 8 V to 12 V 1.6 50.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 11 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. TJ = +25°C 5.75 6.00 6.25 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 8.0 V to 21 V 5.70 6.00 6.30 Regline Line Regulation(4) TJ = +25°C VI = 8 V to 25 V 5.0 120.0 VI = 9 V to 13 V 1.5 60.0 Regload Load Regulation(4) TJ = +25°C IO = 5 mA to 1.5 A 9.0 120.0 IO = 250 mA to 750 mA 3.0 60.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 14 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit TJ = +25°C 7.7 8.0 8.3 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 10.5 V to 23 V 7.6 8.0 8.4 Regline Line Regulation(6) TJ = +25°C VI = 10.5 V to 25 V 5 160 VI = 11.5 V to 17 V 2 80 Regload Load Regulation(6) TJ = +25°C IO = 5 mA to 1.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 15 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit TJ = +25°C 8.65 9.00 9.35 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 11.5 V to 24 V 8.60 9.00 9.40 Regline Line Regulation(8) TJ = +25°C VI = 11.5 V to 25 V 6 180 VI = 12 V to 17 V 2 90 Regload Load Regulation(8) TJ = +25°C IO = 5 mA to 1.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 16 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit TJ = +25°C 9.6 10.0 10.4 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 12.5 V to 25 V 9.5 10.0 10.5 Regline Line Regulation(10) TJ = +25°C VI = 12.5 V to 25 V 10 200 VI = 13 V to 25 V 3 100 Regload Load Regulation(10) TJ = +25°C IO = 5 mA to 1.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 19 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit TJ = +25°C 11.5 12.0 12.5 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 14.5 V to 27 V 11.4 12.0 12.6 Regline Line Regulation(12) TJ = +25°C VI = 14.5 V to 30 V 10 240 VI = 16 V to 22 V 3 120 Regload Load Regulation(12) TJ = +25°C IO = 5 mA to 1.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 23 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit TJ = +25°C 14.40 15.00 15.60 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 17.5 V to 30 V 14.25 15.00 15.75 Regline Line Regulation(14) TJ = +25°C VI = 17.5 V to 30 V 11 300 VI = 20 V to 26 V 3 150 Regload Load Regulation(14) TJ = +25°C IO = 5 mA to 1.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 27 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. TJ = +25°C 17.3 18.0 18.7 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 21 V to 33 V 17.1 18.0 18.9 Regline Line Regulation(16) TJ = +25°C VI = 21 V to 33 V 15 360 VI = 24 V to 30 V 5 180 Regload Load Regulation(16) TJ = +25°C IO = 5 mA to 1.
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 33 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit TJ = +25°C 23.00 24.00 25.00 Output Voltage IO = 5 mA to 1 A, PO ≤ 15 W, VI = 27 V to 38 V 22.80 24.00 25.25 Regline Line Regulation(18) TJ = +25°C VI = 27 V to 38 V 17 480 VI = 30 V to 36 V 6 240 Regload Load Regulation(18) TJ = +25°C IO = 5 mA to 1.
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 10 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol VO Regline Parameter Conditions Output Voltage Line Regulation(20) Min. Typ. Max. TJ = +25°C 4.9 5.0 5.1 IO = 5 mA to 1 A, PO ≤ 15 W, VI = 7.5 V to 20 V 4.8 5.0 5.2 VI = 7.5 V to 25 V, IO = 500 mA 5.0 50.0 VI = 8 V to 12 V 3.0 50.0 VI = 7.3 V to 20 V 5.0 50.0 VI = 8 V to 12 V 1.5 25.0 9 100 TJ = +25°C TJ = +25°C, IO = 5 mA to 1.
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 15 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol VO Regline Parameter Conditions Output Voltage Line Regulation(22) Min. Typ. Max. TJ = +25°C 8.82 9.00 9.16 IO = 5 mA to 1 A, PO ≤ 15 W, VI = 11.2 V to 24 V 8.65 9.00 9.35 VI = 11.7 V to 25 V, IO = 500 mA 6 90 VI = 12.5 V to 19 V 4 45 VI = 11.5 V to 24 V 6 90 VI = 12.5 V to 19 V 2 45 TJ = +25°C, IO = 5 mA to 1.
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 16 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol VO Regline Parameter Conditions Output Voltage Line Regulation(24) Min. Typ. Max. TJ = +25°C 9.8 10.0 10.2 IO = 5 mA to 1 A, PO ≤ 15 W, VI = 12.8 V to 25 V 9.6 10.0 10.4 VI = 12.8 V to 26 V, IO = 500 mA 8 100 VI = 13 V to 20 V 4 50 VI = 12.5 V to 25 V 8 100 VI = 13 V to 20 V 3 50 TJ = +25°C, IO = 5 mA to 1.
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 19 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol VO Regline Parameter Conditions Output Voltage Line Regulation(26) Min. Typ. Max. TJ = +25°C 11.75 12.00 12.25 IO = 5 mA to 1 A, PO ≤ 15 W, VI = 14.8 V to 27 V 11.50 12.00 12.50 VI = 14.8 V to 30 V, IO = 500 mA 10 120 VI = 16 V to 22 V 4 120 VI = 14.5 V to 27 V 10 120 VI = 16 V to 22 V 3 60 TJ = +25°C, IO = 5 mA to 1.
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 23 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified. Symbol VO Regline Parameter Conditions Output Voltage Line Regulation(28) Min. Typ. Max. TJ = +25°C 14.75 15.00 15.30 IO = 5 mA to 1 A, PO ≤ 15 W, VI = 17.7 V to 30 V 14.40 15.00 15.60 VI = 17.4 V to 30 V, IO = 500 mA 10 150 VI = 20 V to 26 V 5 150 VI = 17.5 V to 30 V 11 150 VI = 20 V to 26 V 3 75 TJ = +25°C, IO = 5 mA to 1.
5.75 3 VI = 10V VO = 5V IO = 5mA 5.5 5.25 5 4.75 2 1.5 1 .5 4.5 -50 -25 0 25 50 75 100 0 125 JUNCTION TEMPERATURE (°C) QUIESCENT CURRENT (mA) NORMALIZED OUTPUT VOLTAGE (V) 7 1.01 1 0.99 -25 0 25 50 75 100 10 15 20 25 30 35 TJ = 25°C VO = 5V IO = 10mA 6.5 6 5.5 5 4.5 4 125 JUNCTION TEMPERATURE (°C) 5 10 15 20 25 30 35 INPUT VOLTAGE (V) Figure 4. Output Voltage © 2006 Fairchild Semiconductor Corporation LM78XX / LM78XXA Rev. 1.3.1 5 Figure 3.
1 LM78XX Input 2 CI 0.33μF 3 Output CO 0.1μF Figure 6. DC Parameters 1 LM78XX Input 3 Output 2 270pF RL VO 2N6121 or EQ 0.33μF VO 100Ω 0V 30μS Figure 7. Load Regulation 5.1Ω 1 LM78XX Input 3 Output 0.33μF 2 RL 470μF 120Hz + Figure 8. Ripple Rejection © 2006 Fairchild Semiconductor Corporation LM78XX / LM78XXA Rev. 1.3.1 www.fairchildsemi.
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator Typical Applications (Continued) 1 LM78XX Input CI 2 3 Output CO 0.33μF 0.1μF Figure 9. Fixed-Output Regulator 1 Input CI 3 LM78XX 2 CO 0.33μF Output V XX 0.1μF R1 IQ IO RL V XX IO = + R1 IQ Figure 10. Constant Current Regulator Notes: 29. To specify an output voltage, substitute voltage value for “XX”. A common ground is required between the input and the output voltage. The input voltage must remain typically 2.
(Continued) Input 1 LM7805 Output 3 2 CI 0.33μF - 2 LM741 + 3 4 6 CO 0.1μF 10kΩ IRI ≥ 5 IQ VO = VXX(1 + R2 / R1) + IQR2 Figure 12. Adjustable Output Regulator (7 V to 30 V) Q1 BD536 Input IQ1 R1 1 3Ω R1 = IO IREG V BEQ1 Output 3 LM78XX 2 0.1μF 0.33μF IREG–IQ1/ BQ1 IO = IREG + BQ1 (IREG–VBEQ1/R1) Figure 13. High-Current Voltage Regulator Input Q1 RSC Q2 R1 1 LM78XX 3 Output 3Ω 0.33μF Q1 = TIP42 Q2 = TIP42 RSC = 2 0.1μF V BEQ2 I SC Figure 14.
(Continued) 1 3 LM78XX VI VO 2 0.33μF 0.1μF 7 COMMON 6 COMMON 2 LM741 4 -VIN _ 4.7kΩ + 3 4.7kΩ -VO TIP42 Figure 15. Tracking Voltage Regulator 1 3 LM7815 +20V +15V 0.33μF + 2 0.1μF 1N4001 2.2μF 1μF + 1 2 -20V 1N4001 3 MC7915 -15V Figure 16. Split Power Supply (±15 V - 1 A) © 2006 Fairchild Semiconductor Corporation LM78XX / LM78XXA Rev. 1.3.1 www.fairchildsemi.
(Continued) Output Input + 0.1μF 2 1 3 LM78XX Figure 17. Negative Output Voltage Circuit D45H11 Input 1mH Output 470Ω 4.7Ω Z1 1 + 0.33μF LM78XX 3 2 10μF + 0.5Ω 2000μF Figure 18. Switching Regulator © 2006 Fairchild Semiconductor Corporation LM78XX / LM78XXA Rev. 1.3.1 www.fairchildsemi.
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator Physical Dimensions Figure 19. TO-220, MOLDED, 3-LEAD, JEDEC VARIATION AB (ACTIVE) © 2006 Fairchild Semiconductor Corporation LM78XX / LM78XXA Rev. 1.3.1 www.fairchildsemi.
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